Radio dial scales projector



W an!!! H. ATWQOD, JR

RADIO DIAL $CALES PROJECTOR 7 Filed May 20, 1944 I N VEN TOR.

HTTOKNEY I Patented Feb. 10, 1948 RADIO DIAL SCALES PROJECTOR Horace Atwood, Jr., Belleville. N. 1., assignor to Allen B. Du Mont Laboratories, Inc., Passaic,

N. J a corporation of Delaware Application May 20, 1944, Serial No. 536,528

1 This invention relates to a device which facilitates the tuningof the radio in a combined A radio and television receiver. visual indication is provided to show when the radio receiver is tuned to the desired station whether that station is transmitting at the time of tuning or not.

In carrying out the invention a scale is projected by light upon the inside surface of the screen of the cathode-ray tube of the television receiver where it can be seen at the position of an observer of the screen. This scale is located upon a plate. A mask or shutter is located in front of the plate and is adapted to be moved with the band-changing switch.

The invention may be understood from the description in connection with the accompanying drawing, in which Fig. 1 is a somewhat diagrammatic end view of a combined radio-television set;

Fig. 2 is a side view: and

Fig. 3 is a front view on an enlarged scal showing some of the details.

In the drawing, reference character I indicates a cabinet for accumulating both a radio and a television set. The electrical connections for the television and radio are not shown as they may be of the well known sort.

An opening 2 is provided at the front of the cabinet I through which the face 3 of the television tube 4 may be seen. The television tube is supported as usual on a chassis and is connected to the electric circuits in the usual way. A frequency range selector knob 5 is provided for radio channels not shown. These bands or channels may, for example, be the frequency ranges from 550 kc. to 1500 kc.; 1600 kc. to 4 mc.; and 9 me. to 11.5 me. The shaft 6 to which the knob 5 is connected is iournaled in the wall I and in a bearing in the support I. It is for operating the frequency selector switches for the radio channels, not shown.

The knob 8 is for turning the shaft 8 that is located below the shaft 8 and is also iournaled in the wall I and in a bearing in the support I. It is for tuning to different frequencies in the several channels. I

A sector shaped plate It (Fi 3) is attached to the inner end of the shaft 8. This plate is made of opaque material and is provided with somewhat rectangularly. shaped openings II, I2 and I3 with arcuate sides and with the ends extending radially. Pointers or markers I I I2 and I3 are provided along the inner edges of the 'openings II, I2 and".

With this device 1 Claim. (01. 88 -24) An arm II, which is connected to the inner end of the shaft 9 is parallel to and behind the plate It. It is. provided with an enlarged end portion I5 which is made of transparent or translucent material and may be colored if desired. Three graduated scales I8, I1 and I8 are provided on the portion IS, the lines and other markings of the scales being made of opaque or colored material.

An electric light I8 islocated in the cabinet I behind the plate I and the enlarged portion I of the arm I4. A lens system is located in position to focus the graduated scales I6, I! and I8 upon the inner face 3 of the tube 2.

The shaft 8 is to beconnected in the usual way to a selector switch which selects the desired I channel corresponding to the position to which responding-opening II, I2 or it is brought into position in front of the enlarged portion it that is carried by the arm I4. With the desired frequency channel thus selected. the button 8 is used to turn the shaft 9 that the corresponding scale I8, II or I8 will have its lower edge even with the corresponding pointer II, I2 or ii, so that the radio can be tuned to any partlcularfrequency of whatever channel has been selected by turning the button 5.

With this invention, the tuning to any station in several different frequency channels can be quickly effected and the operator can see the pointer and graduations on an enlarged scale from in front'of the face 3 of the tube 4, and since this is shown on'the background of a lighted surface, the readings are very easily seen whether the room is dark or lighted.

When the television is not being used the tunins knobs 5 and 8 are used for enabling the ma nified images of the tuning scales I8, I! and I8 and the pointers II, I2 and I3" to be projected by the lens system 20 upon the face of the television tube wherethey can be clearly seen on the television screen that is located on the inside surface of the large end of this tube.

The pointers Il'. I2 and I 3' always show th radio channel to which the radio is tuned, and the graduated scales I8, I1 and I8 show the particularv frequencies of the several channels to in common use and are well understood by those skilled in this art.

What is claimed is:

A device for facilitating the tuning of the radio in a combined radio and television receiver, which comprises a cabinet having a circular opening at the front thereof, a television receiving tube so located in said cabinet that its face-projects into a in said cabinet aligned with the axis of said tube.

a V-shaped plate of opaque material having an arcuate end and being mounted near its opposite end on one of said shafts and having arcuate openings therethrough near said arcuate end, an

4 arm mounted on the other shaft and having an enlarged end portion of light transmitting material thereon parallel to said V-shaped plate with a scale on said enlarged end portion, said source 6 of light being on the other sides of said plate and scale from said television tube face.

' HORACE ATWOOD, J a.

REFERENCES CITED 10 The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 15 Re. 22,000 Anderson Jan. 13, 1942 1,951,036 Parker Mar. 13, 1934 2,063,610 Llnsell Dec. 8, 1936 2,103,333 MeWeeny Dec. 28, 1937 2,176,673 Krause Oct. 17, 1939 go 2,207,510 Flaherty et a1 July 9, 1940 2,251,984 Cleaver et al. Aug. 12, 1941 2,316,550 Bigalke Apr. 13, 1943 2,347,977 Van Lieshout May 2, 1944 

